The NA51 experiment produced only one data point, and suggested that there are more anti-down quarks in the proton than anti-up quarks, at the fractional momentum studied in the experiment.

The proton can contain pairs of elementary particles known as strange quarks. The contribution of these particles to the proton's electric-charge distribution and magnetic moment has been determined.

Inside every proton in every atom in the universe is a pressure cooker environment that surpasses the atom-crushing heart of a neutron star. That's according to the first measurement of a ...

Inside every proton in every atom in the universe is a pressure cooker environment that surpasses the atom-crushing heart of a neutron star. That's according to the first measurement of a ...

You often hear that each nucleon, like a proton or neutron, has three quarks inside of it, and that the quarks exchange gluons. But that isn’t the full picture at all.

Nuclear physicists have found that strange quarks do contribute to the structure of the proton. This result indicates that, just as previous experiments have hinted, strange quarks in the proton's ...

Bizarrely, the proton’s mass must somehow arise from the energy of the stretchy gluon strings, since quarks weigh very little and gluons nothing at all. Physicists uncovered this odd quark-gluon ...

The intrinsic charm quarks carry about 0.6 percent of a proton’s momentum, the researchers report. But 5 sigma is typically required for a conclusive result.

“There are six kinds of quarks in nature, three are lighter than the proton [up, down, and strange quarks] and three are heavier [charm, up, and down quarks],” Stefano Forte, NNPDF ...

The textbook description of a proton says it contains three smaller particles - two up quarks and a down quark - but a new analysis has found strong evidence that it also holds a charm quark ...

Proton’s mass radius is apparently shorter than its charge radius The quarks that give it charge aren't hanging out with the gluons that provide mass.